Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 988,331	$ 419,131
Adjustments to reconcile net income to cash provided by operating activities:
Provision for policy losses and other claims	445,677	414,001
Depreciation and amortization	118,475	110,652
Impairment losses on exit of business	0	73,264
Amortization of premiums and accretion of discounts on debt securities, net	32,890	28,678
Net realized investment gains	(428,590)	(49,491)
Share-based compensation	46,633	44,000
Equity in earnings of equity method investments, net	(6,066)	(3,556)
Dividends from equity method investments	8,980	4,383
Changes in assets and liabilities excluding effects of acquisitions and noncash transactions:
Claims paid, including assets acquired, net of recoveries	(356,445)	(342,721)
Net change in income tax accounts	58,841	(47)
Increase in accounts and accrued income receivable	(53,661)	(72,670)
Increase in accounts payable and accrued liabilities	70,388	32,030
(Decrease) increase in deferred revenue	(28,131)	21,668
Other, net	(21,340)	1,723
Cash provided by operating activities	875,982	681,045
Cash flows from investing activities:
Net cash effect of acquisitions/dispositions	(60,966)	(387,024)
Net (increase) decrease in deposits with banks	(7,724)	1,859
Purchases of debt securities	(4,973,589)	(1,962,074)
Proceeds from sales of debt securities	869,057	694,588
Proceeds from maturities of debt securities	1,403,680	1,157,725
Purchases of equity securities	(135,600)	(169,694)
Proceeds from sales of equity securities	78,658	92,318
Net change in notes receivable	(12,698)	(11,116)
Advances under secured financing agreements	(19,292,193)	(11,619,818)
Collections of secured financings receivable	19,389,457	11,185,121
Capital expenditures	(111,080)	(91,601)
Proceeds from sales of property and equipment	13,137	13,951
Proceeds from insurance settlement	11,815	123
Cash used for investing activities	(2,828,046)	(1,095,642)
Cash flows from financing activities:
Net change in deposits	2,157,506	162,209
Borrowings under secured financing agreements	17,938,875	10,964,792
Repayments of secured financings payable	(17,861,423)	(10,716,660)
Net proceeds from issuance of unsecured senior notes	641,849	443,936
Borrowings under unsecured credit facility	0	120,000
Repayments of borrowings under unsecured credit facility	0	(280,000)
Repayments of notes and contracts payable	(5,454)	(4,228)
Net activity related to noncontrolling interests	(3,034)	(2,090)
Net proceeds (payments) in connection with share-based compensation	1,023	(5,597)
Repurchases of Company shares	(78,846)	(68,864)
Payments of cash dividends	(157,066)	(147,768)
Cash provided by financing activities	2,633,430	465,730
Effect of exchange rate changes on cash	(2,845)	(3,122)
Net increase in cash and cash equivalents	678,521	48,011
Cash and cash equivalents—Beginning of period	1,275,466	1,485,959
Reclassification to assets previously held for sale	0	(21,601)
Cash and cash equivalents—End of period	1,953,987	1,512,369
Supplemental information:
Interest	42,481	30,034
Premium taxes	70,154	59,523
Income taxes, less refunds of $126 and $3,168	$ 261,372	$ 122,086